fix(database): verify handle belongs to current runtime before block_in_place

[forkfury]

Fix

Prevents potential deadlock when WrapDatabaseAsync is created with a handle from a different runtime via with_handle(). The code now verifies that the stored handle belongs to the current runtime before using block_in_place.

Changes

• Add pointer equality check to ensure handle belongs to current runtime before calling block_in_place
• Update comments to clarify the runtime ownership requirement

[codspeed-hq]

CodSpeed Performance Report

Merging #3212 will not alter performance

_{Comparing forkfury:fix/async-db-handle-runtime-check (eea2fa8) with main (eb37a15)}

Summary

✅ 173 untouched